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Where is the best place to buy the best graphic calculator from? - where to buy softwell maker

Hello, Sixth Form College student, who has the best simulator to help it, if possible, to study in the A-level mathematics. I think, get a price / graphics scientific calculator around £ 25 - £ 65th Can you tell me what store sells this type of machine and it makes the best brands?

I need a graphing calculator as soon as possible. Any help would be good.